Thomas peentiss sanborn



tuted gisten THOMAS PRENTISS SANBORN,

or BosToN, MASSACHUSETTS.

. .Letters Patent No. 107,549, dated -Sqitember 20, 1870.

The Schedule referred to :in these Letten Pltent and making part of the lame.

To all whom it may concern.-

Be it known that I, THOMAS PRENzriss SANBORN, of Boston, in the county of Suolk and State of Massachusetts, have invented a new and useful Improvement in Organ-Tremulant; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing formingvpart of this specification.

This invention relates to a new and useful i|nprovelnentin a device for producing the tremulous sound of the pipes of the church-organ, and consists in a cylinder and valve, with a vibrating rod, with balls or weights thereon, and with a thumb-screw for regulating'the mot-ion of the valve, arranged to operate as hereinafter more fully described.

In the'accompanying drawing- Figure 1 represents a vertical section of my iniproved tremulant, taken on the line x :c of tig; 2.

Figure 2 is a 'top vieu'.

Similar letters of reference indicate corresponding parts.

A is the cylinder, which may be made of either wood or metal.

B is the top ofthe cyiinder,the underside of' which ltop is the valve-seat.

C C are openings in the top, for the escape ot' the air.

I) is the valve, and E is the valve-stem.

F is a guide-piece for the lower end of the stem.

G is a regulating-screw, through which the valvest'em works, as seen in fig. 1.

H is a vibrating rod, supported in the pivot-piece I o n the stand J.

K K are balls or weights'on t-he rod, which are made adjustable thereon by means of screw-threads.

mating-screw, and presses upward on the valve-stem,

and limits the motion of the valve.

The vibration of the ro'd H is regulated by the ad-- justable balls K K.

The pressure of the air upon the under sideof the valve, as it passes through t-lic cylinder, causes the vibration and tremulous sound.

The valve is closed against the pressure of the spring M, butthe reaction pel-'mits the valve to drop, the et'- fect being not unlike that of water urn the valve of a hydraulic-ram, producing a concussion, which causes the tremulous sound ofthe organ-pipes.

This is a most simple and compact arrangement, sure and uniform in its action, under all circumstances, whetheroneor all the stops in the organ arc drawn, or a full chordis played, and is entirely independent ofthe action of the bellows.

The adjusting arrangement is so p erfect that the valve may be rendered as sensitive as may be desired. l

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- In combination with an organ-tremulant, the cylindcr A, valve D, seat B, regulating-screw G, and vibrating rod H, with the adjustable balls or .weights K K, when the same are arranged to operate substantially as and for the purposes herein shown and de.- scribed.

THOMAS PRENTISS SANBORN.

Witnesses:

MOODY MERRILL, F. M. HoLBRooK. 

